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Table 1 Water Level Data and Groundwater Analytical Results-Chevron Service Station#9-6171, 6633 Pacific Avenue, Stockton, California(continued) FXPLANArD MTES (continued) TOC =Top of casing elevation 16 Gasoline range concentration reported,peaks are representative of tetrachloroethane (ft) =Feet and trace amount of gasoline DTW= Depth to water 11 Gasoline range concentration repotted The chromatogram shows only a single peak GWE—Groundwater elevation 17 Both gasoline and a single solvent peak (chlorinated) were observed in the msl —Measurements referenced relative to mean sea level chromatogram TPH(G)= Total Purgeable Petroleum Hydrocarbons as Gasoline 13 Both gasoline and a single solvent peak are observed in the chromatogram B =Benzene 1 1 Detection Inert raised due to foaming sample matrix T=Toluene " TOC elevation for well MW-7 was surveyed by Ron Miller, Licensed Land E=Ethylbenzene Surveyor,PE#15816 on September 13, 1993 X=Xylenes " Carryover from previous sample to run sequence made it necessary to analyze EDB= Ethylene dibromrde backup sample Backup sample foamed,therefore,no data is available TOG=Total Oil and Grease " The sample was diluted due to high concentration of non target compounds VOC -Volatile Organic Compound Hydrocarbons in the gasoline sample do not match the gasoline standard pattern MTBE=Methyl tertiary butyl ether " The sample was diluted due to high concentrations of non-target compounds —-Not analyzed/not applicable 19 MTBE was also analyzed and not detected at detection limit of 2 5 ppb ppb=Pants per billion 20 Laboratory reported discrete peak C8-C9 2' Laboratory reported unidentified hydrocabron <C9 NOTES 21Laboratory report indicates discrete peaks C7-C8 27 Laboratory report indicates discrete peaks C6 C8 TOC elevations were surveyed by Ron Miller, Licensed Land Surveyor, CE#15816 on 24 Laboratory report indicates unidentified hydrocarbons C6-C12,discrete peaks C6 September 5, 1996 25 MTBE by EPA Method 8260 '-6 Split sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental Water level elevation data and laboratory analytical results poor to May 36, 1995,were Services of West Sacramento Analytical result supplied by Levine-Fricke-Recon compiled from Quarterly Monitoring Reports prepared for Chevron by Sierra Environmental Laboratory report indicates unknown hydrocarbons detected at 3,000 ppb See Services specific analytical results for further explanation 27 Split sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental Field parameters and analytical data for 8113196 and 11/11/96 may be found in the Services of West Sacramento Analytical result supplied by Levine-Fncke-Recon respective quarterly monitoring reports for the specific events Laboratory report indicates unknown hydrocarbons detected at 170 ppb See specific analytical results for further explanation • Product thickness was measured with an MMC flexr-dip interface probe 31 Split sample taken by Levine Fricke-Recon,analyzed by Quanterra Environmental Services of West Sacramento Analytical result supplied by Levtne-Fricke-Recon ' Monitoring well abandoned on July 31, 1992 Laboratory report indicates unknown hydrocarbons detected at 530 ppb See specific ' EDB was also analyzed and not detected at detection limits of 0 2 ppb analytical results for further explanation ' TOG was also analyzed and not detected at detection limits of 5,000 ppb 19 Split sample taken by Levine Fricke-Recon,analyzed by Quanterra Environmental ' Gasoline range concentration reported Peaks not associated with gasoline are Services of West Sacramento Analytical result supplied by Levine-Fricke-Recon observed early in the chromatogram Laboratory report indicates unknown hydrocarbons detected at 98 ppb See specific I ' Both gasolene and multiple solvent peaks were observed in the chromatogram analytical results for further explanation Umcategonzed compound is not included in the gasoline hydrocarbon concentration w Splen sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental ' Detection limit raised due to surfactants Services of West Sacramento Analytical result supplied by Levine-Fricke-Recon Typical gasoline pattern not present Peak at 7 2 minutes subtracted from gasoline See specific analytical results for further explanation range before calculating gasoline concentration " Laboratory report indicates unidentified hydrocarbons C6-C12 ' Non-gasoline components which were not identified by the laboratory present in sample at 150 ppb, 11/29/90 Non-gasoline components which were not identified by the laboratory present in sample at 300 ppb,3114191 5121 TQM 7